1 //===================================================== 2 // File : STL_Timer.hh 3 // Author : L. Plagne <laurent.plagne@edf.fr)> 4 // Copyright (C) EDF R&D, mar d�c 3 18:59:35 CET 2002 5 //===================================================== 6 // 7 // This program is free software; you can redistribute it and/or 8 // modify it under the terms of the GNU General Public License 9 // as published by the Free Software Foundation; either version 2 10 // of the License, or (at your option) any later version. 11 // 12 // This program is distributed in the hope that it will be useful, 13 // but WITHOUT ANY WARRANTY; without even the implied warranty of 14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 // GNU General Public License for more details. 16 // You should have received a copy of the GNU General Public License 17 // along with this program; if not, write to the Free Software 18 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 19 // 20 // STL Timer Class. Adapted (L.P.) from the timer class by Musser et Al 21 // described int the Book : STL Tutorial and reference guide. 22 // Define a timer class for analyzing algorithm performance. 23 #include <iostream> 24 #include <iomanip> 25 #include <vector> 26 #include <map> 27 #include <algorithm> 28 using namespace std; 29 30 class STL_Timer { 31 public: STL_Timer()32 STL_Timer(){ baseline = false; }; // Default constructor 33 // Start a series of r trials: start(unsigned int r)34 void start(unsigned int r){ 35 reps = r; 36 count = 0; 37 iterations.clear(); 38 iterations.reserve(reps); 39 initial = time(0); 40 }; 41 // Start a series of r trials to determine baseline time: start_baseline(unsigned int r)42 void start_baseline(unsigned int r) 43 { 44 baseline = true; 45 start(r); 46 } 47 // Returns true if the trials have been completed, else false check()48 bool check() 49 { 50 ++count; 51 final = time(0); 52 if (initial < final) { 53 iterations.push_back(count); 54 initial = final; 55 count = 0; 56 } 57 return (iterations.size() < reps); 58 }; 59 // Returns the results for external use get_time(void)60 double get_time( void ) 61 { 62 sort(iterations.begin(), iterations.end()); 63 return 1.0/iterations[reps/2]; 64 }; 65 private: 66 unsigned int reps; // Number of trials 67 // For storing loop iterations of a trial 68 vector<long> iterations; 69 // For saving initial and final times of a trial 70 time_t initial, final; 71 // For counting loop iterations of a trial 72 unsigned long count; 73 // true if this is a baseline computation, false otherwise 74 bool baseline; 75 // For recording the baseline time 76 double baseline_time; 77 }; 78 79